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The blue-eyed black lemur is thought to be the only primate with blue eyes - except humans

A new survey shows lemurs are far more threatened than previously thought.

A group of specialists is in Madagascar - the only place where lemurs are found in the wild - to systematically assess the animals and decide where they sit on the Red List of Threatened Species.

More than 90% of the 103 species should be on the Red List, they say.

Since a coup in 2009, conservation groups have repeatedly found evidence of illegal logging, and hunting of lemurs has emerged as a new threat.

The assessment, conducted by the Primate Specialist Group of the International Union for the Conservation of Nature (IUCN), concludes that 23 lemurs qualify as Critically Endangered - the highest class of threat.

Fifty-two are in the Endangered classification, and a further 19 Vulnerable to extinction.

"That means that 91% of of all lemurs are assessed as being in one of the Red List threatened categories, which is far and away the largest proportion of any group of mammals," said Russ Mittermeier, chairman of the specialist group and president of Conservation International.